Electric heater



Aug. 23, 1932. P, A, GOLDF|sCH 1,872,730

ELECTRIC HEATER Filed Aug. 51. 1929 wel 2 A TTORNE Y Patented Aug. 23, 1932 UNITED: STATES PATENT owl-FICEg PHILIP A. GOLDFISCH, 0F KANSAS CITY, MISSOURI, ASSIGNOR T0 LABORATORY N-'f- BTRUCTION COMPANY', CF KANSAS CITY, MISSOURI, A CORPORATION OF MISSOURI.

ELECTRIC HEATER Application led Aug/ust 31, 1929. 4Serial No. 389,685..

This 'invention relates to electric rheaters and particularly to that type of device adapted for heating sphericalviiasks used indistillation. f y y f The principal object ,of this invention is the provision of an electric heater having a series of elongated resistance coils disposed in right arcuate concave position.

A further object of the present yinvention is the provision of a specially constructed casing made of a plurality of kmeinberspnovelly positioned together and having walls formed to deflect heat fromthe heat unit toward a common central area. l

Another object of' the present invention is 'the provision of ank electric heater having `new and novel heating yelement and heating element connections. y T

A still furtherobject of this invention resides in providing, a device which is simple and durable in construction, inexpensive to manufacture and one which will be extremely efficient and useful in'operation.

With these general objects in view as well as minor objects which will appear yduring the course of the detailed specification, reference will now be had to the accompanying drawing in which:

Figure 1 is a perspective view of an electric heater embodying this invention;

Fig. 2 is a vertical cross section taken on line II-II of Fig. 1;

Fig. 3 is a vertical cross section taken on line III- III of Fig. 2;

Fig. 4 is an inverted plan view of the top member of the casing;

Fig. 5 is a plan view of the heater with the top member of the casing removed;

Fig. 6 is an inverted plan of the body of refractory material;

Fig. 7 is a diagonal cross section taken on line VII-VII of Fig. 4;

Fig. 8 is an enlarged fragmentary sectional view taken on line VIII-VIII of Fig. k5;

Fig. 9 is an enlarged inverted plan view of the terminal post. y

Like reference characters designate similar parts throughout the several views and the numeral y10 designates a rectangular base member made of any suitable heat resisting material and having a recess 11 formed in the upper surface thereof. Said base member is provided at its corners with suitable legs 12 by means of which the main body of the base member is supported above the supporting surface.

Positioned in recess 11 of base 1() is a body 13 of refractory material having a concave right circular surface 14 Which is provided with a series of similar, parallel,longitudinal grooves 15 adapted to receive the electric heating coilsf16 in such a manner that their outer surfaces are in a surface concentric ,witlij said right circular surface 14. The

lower surface of body 13 is recessed in such a manner that ysaid refractory body is substantially yof equal thickness. throughout its entire area thus'lessening the chanceoffracture. due to unequal expansion' and contraction.

rReferring to Fig. 5, it will be noted that the series of electric heating coils 16 are positioned with their opposite ends uniformly equidistant from the ends of body 13 with opposite ends, respectively, of the outer coils provided with a terminal wire17 which extends through vertical opening 18 formed in body 13. The coils 16y are formed in,` series by a connecting loop 41`between each of said coils and connecting successive coils inseries, which passes throughend slots 42 formed in body 13 and around a boss 43 formed thereon,

thus the end of each coil is securely anchored tobase 13 to hold the coil securely in their respective grooves.

* Positioned below eachlof theholes 18 and securely mounted in base member 10 isy [a binding post 19 having a cylindrical head 20 and a downwardly projecting threaded stem 21 which extends through an opening 21 yformed in base 10 and is provided with bindingnuts 23 by means of which it is held in position. Nuts 23 also serves to bind, the feed wire 24 in electrical contact with the binding post. j n

Referring to Fig. 8, it will be noted that the lower portion of head 20 is positioned in a recess 25 formed in base 10 in such a manner that the securing stem 21is positioned at the inner surface of the head 20 thereby `ved.

by dipping the end of said wire in some suitpositioning said stem and the nuts a sufficient distance away from the inner walls of legs 12 to allow room for adjustment. Vhen the terminal 19 is thus positioned it will bev secured against relative movement with said base and the hole 2G extending through head 20 adjacent its outer edge will be in register with one of the holes 1S thus allowing the insertion of terminal wires 17 therein.

'When the vterminal wire is positioned .in hole 26 a set screw .27 is 4tightened thereagainst, thus making a good electrical contact with said post. Posts 19 are positioned beneath refractory body 13 and extend into recesses 28 respectively which are 'formed in the under side of body 13 vthereby protecting said terminal from excessive heat. In order to obtain a better contact, terminal wire 17 .is preferably folded backen itself and twist- This however, might be accomplished .able conducting materialto increase its diameter.

In order to permit easy access'to screws .i7 when the top casing member 29 is removed a lportion of the flange 3'1 is cut away .at 44.

which .normally would extend .above said screw.

TCoextensi-ve with basemember 10 and positioned .thereon :is a top casing member .29 having arecess .30 formed in its under side adapted to receive the upperportion `of the refractory7 body member 13 which .extends above lbase 10. .In order to retain the two casing members 10 and 29 in proper relative position, a. downturned flange V.31 having a downwardly and outwardly converging wall 32 is yadapted -to overhang .the upwardly extendingliange 33 of base member 10 'which .has -an upwardly and inwardly extending outerwall 34. Also, downwardly extending .lips-35 carried 'by top Q9 are 'adapted to fit .in vrecesses 36 formed in baselO. The walls l'tral portion. Referring to Fig. 2,in which the lvessel V is shown in dotted llinesit will be noted that the portionof the Y'vessel adjacent the electric heating coils 16 is concentric therewith `thus heating a large area of said vessel to substantially uniform degree. T he top member 29 is provided with a shoulder 39 which when -said vtop .member is inposition, rests 4on top of body member 13 thus holding it 1in rfixed position vin 'the casing. .Theside wall 40 of Vopening? intermediate zone 38 and the body 13 is upwardly and inwardly converging thus directing the heat from the heating coils toward a common center.

I do not wish to limit this invention to the struc-ture shown and described as many modifications may be made within the scope of opening, the said arc being generated from a center positioned on the axis of the said right `arcuate concave face of said body of refractory .material and in a. plane perpendicular to said axis intersecting said surface vat its center; an annular wall joining saidvflask-supporting surface at the opening edge, said wall Aoverhanging said resistance coils .and .having a converging annular face whereby to direct heat from the said coils toward the said circular opening; a binding post `extendimgf through one of said casing members and terminating below the body of refractory material; a hole through said .binding post; a bale through said body of refractory `material .in axial alinement with the hole through the binding post; and a terminal wire vextending from one `of said coils through the hole in the body of refractory material and int-othe hole of said bind- .ing post.

In testimony whereof, I hereunto aiiix my si gnature.

PHILIP A. GOLDFISCH.

.. .immutata 

